2002

6.2

2003

3.8

2005

6.2

1973

7.1

2010

4.2

1994

7.0

2005

6.8

2006

7.1

1999

7.8

2003

7.2

2001

6.7

2006

6.3

1995

6.7

2005

5.6

2001

7.3

1997

6.8

2005

6.6

2005

6.8

1992

5.7

2007

7.2